| 张腾，谭建伟，田茂军，韩文涛，周伟伟，李云强.天然气发动机氨排放控制应用研究[J].内燃机工程,2021,42(1):47-52. |
| Application Study on NH3 Emission Control of Natural Gas Engines |
| DOI：10.13949/j.cnki.nrjgc.2021.01.008 |
| Key Words:NH3 emission three way catalyst(TWC) natural gas engine control technical scheme |
| Author Name | Affiliation | | ZHANG Teng,TAN Jianwei,TIAN Maojun,HAN Wentao, ZHOU Weiwei,LI Yunqiang | 1.Weichai Westport Co., Ltd.， Weifang 261061， China；2.School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081, China
3.China Automotive Engineering Research Institute Co.,Ltd.， Chongqing 401122， China；4.Weichai Power Co., Ltd.， Weifang 261061， China |
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| Abstract:Using a natural gas engine emitted to CN Ⅵ emission standard, the engine’s emission data under normal operating conditions were collected by a full-flow dilution system, and the influence of excess air ratio, catalyst temperature, and CO and NOx emission concentrations on NH3 emissions was analyzed. And on this basis, several methods for controlling NH3 emission were proposed. Results show that when the excess air ratio is greater than 0.965, NH3 emission will gradually decrease, while CO emission has a greater impact on NH3 emission, causing NH3 emission to show a positive growth with increased CO concentration within a certain range. However, there is no obvious relationship between NH3 emission and NOx emission. Moreover, when the three-way catalytic(TWC) converter system is wrapped with thermal insulation material, NH3 emission decreases with the increase of catalyst temperature. In view of this, among the 3 kinds of technologies for controlling NH3 emission from natural gas engines,it is currently recommended to use two-stage TWC technology to control the NH3 emissions of natural gas engines. When an applicable ammonia slip catalyst(ASC) can be successfully developed to eliminate NH3 escaped from TWC aftertreatment system, the use of TWC plus ASC will be a preferred solution for the emission control of natural gas engines in the future. |
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